Description
It's a skill in which you stomp the ground with force, temporarily immobilizing an enemy and causing damage. The energy from the stomping foot travels through the ground, thus cannot be deflected by Defense. However, if the opponent is already being attacked by someone else, they will not receive the damage. If they have tolerance to long-range attacks, the duration of their immobilization and damage can be diminished.

Details
Giant-only Skill
It is an area attack that hits all moving targets in front of the player and stuns them but does not knock them down.
It can be used to Skill-Lock enemies, but only if the timing is perfect and the enemy is slow.
Ignores the Defense skill and stat (Ex. Stomping a Bandersnatch through 100 defense).
Ignores the target's Protection when calculating critical rate.
Always triggers Natural Shield on monsters that have it.
Due to its inherently low damage, it is recommended to utilize a high critical rate and high rank of Critical Hit, and/or high balance if planning to use this skill.
Weapon speed does not affect Stomp speed.
Useful to knock Mimics out of hiding.
When used on Reus River a hole in the ice is formed and can be fished in.
Like the Windmill skill, without the cost of hp. However, it won't reach behind you, it cannot be loaded when being knocked down, and no other skills can be loaded in its animation stage.
Unlike Fomor's Stomp, Giant's Stomp cannot knock a Human or Elf out of Play Dead.
Stomp does not seem to change an enemies aggro state, so can be useful if trying to avoid detection.
Control-targeting the enemy will ensure you only use the skill when the enemy is in range.